const buttonGroupInstance = (
  <ButtonGroup>
    <Button>1</Button>
    <Button>2</Button>
    <DropdownButton title="Dropdown" id="bg-nested-dropdown">
      <MenuItem eventKey="1">Dropdown link</MenuItem>
      <MenuItem eventKey="2">Dropdown link</MenuItem>
    </DropdownButton>
  </ButtonGroup>
);

ReactDOM.render(buttonGroupInstance, mountNode);
